/* ========================================
   KUJALI - Institutional Knowledge Portal
   CSS Rendszer
   ======================================== */

/* Color Palette */
:root {
  --primary: #2C5F72;
  --primary-light: #3a7a8a;
  --primary-dark: #1f4453;
  --secondary-light: #E0E0E0;
  --secondary-warm: #F5EFE6;
  --accent-gold: #B8A066;
  --text-dark: #2a2a2a;
  --text-light: #f5f5f5;
  --border-color: #d0d0d0;
  --white: #ffffff;
  --black: #000000;
  
  /* Spacing System (8px base) */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-xxl: 64px;
  
  /* Typography */
  --font-heading: 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-body: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* ========================================
   RESET ÉS BASE STYLES
   ======================================== */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--white);
  font-size: 16px;
}

/* Typography */
h1 {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-lg);
  color: var(--primary);
}

h2 {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--primary);
}

h3 {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: var(--spacing-sm);
  color: var(--primary);
}

p {
  margin-bottom: var(--spacing-md);
  line-height: 1.8;
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: all 0.2s ease;
}

a:hover {
  color: var(--accent-gold);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* Lists */
ul, ol {
  margin-left: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

li {
  margin-bottom: var(--spacing-xs);
}

/* ========================================
   CONTAINER ÉS LAYOUT
   ======================================== */

.container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.container-fluid {
  width: 100%;
}

/* Flexbox Utilities */
.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.flex-column {
  display: flex;
  flex-direction: column;
}

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

/* Grid */
.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-lg);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-lg);
}

/* ========================================
   HEADER ÉS NAVIGATION
   ======================================== */

header {
  background-color: var(--primary);
  color: var(--text-light);
  padding: var(--spacing-md) 0;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--accent-gold);
  text-transform: uppercase;
  letter-spacing: 2px;
}

nav ul {
  display: flex;
  list-style: none;
  gap: var(--spacing-lg);
  margin: 0;
}

nav a {
  color: var(--text-light);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding-bottom: 4px;
}

nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--accent-gold);
  transition: width 0.3s ease;
}

nav a:hover::after {
  width: 100%;
}

nav a.active::after {
  width: 100%;
}

/* Mobile menu toggle */
.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--text-light);
  font-size: 1.5rem;
  cursor: pointer;
}

/* ========================================
   HERO SECTION
   ======================================== */

.hero {
  margin-top: 80px;
  padding: var(--spacing-xxl) 0;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--text-light);
  position: relative;
  overflow: hidden;
}

.hero-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-xxl);
  align-items: center;
}

.hero-text h1 {
  color: var(--text-light);
  font-size: 3.5rem;
  margin-bottom: var(--spacing-lg);
}

.hero-text p {
  font-size: 1.2rem;
  line-height: 1.8;
  margin-bottom: var(--spacing-lg);
  color: rgba(255,255,255,0.95);
}

.hero-image {
  position: relative;
  height: 500px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 10px 40px rgba(0,0,0,0.3);
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ========================================
   SECTIONS ÉS CONTENT
   ======================================== */

section {
  padding: var(--spacing-xxl) 0;
}

.section-dark {
  background-color: var(--primary);
  color: var(--text-light);
}

.section-dark h2,
.section-dark h3 {
  color: var(--text-light);
}

.section-light {
  background-color: var(--secondary-warm);
}

.section-alt {
  background-color: var(--secondary-light);
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-xl);
}

.section-title h2 {
  margin-bottom: var(--spacing-md);
}

/* ========================================
   CARDS
   ======================================== */

.card {
  background: var(--white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  transition: all 0.3s ease;
}

.card:hover {
  box-shadow: 0 8px 24px rgba(0,0,0,0.08);
  transform: translateY(-2px);
}

.card img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
}

.card h3 {
  margin-bottom: var(--spacing-sm);
  font-size: 1.3rem;
}

.card p {
  font-size: 0.95rem;
  color: #666;
  margin-bottom: var(--spacing-sm);
}

/* ========================================
   BUTTONS
   ======================================== */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--primary);
  color: var(--text-light);
  border: 2px solid var(--primary);
  border-radius: var(--radius-md);
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
}

.btn:hover {
  background-color: var(--primary-dark);
  border-color: var(--primary-dark);
}

.btn-secondary {
  background-color: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

.btn-secondary:hover {
  background-color: var(--primary);
  color: var(--text-light);
}

/* ========================================
   FOOTER
   ======================================== */

footer {
  background-color: var(--primary);
  color: var(--text-light);
  padding: var(--spacing-xxl) 0 var(--spacing-xl);
  margin-top: var(--spacing-xxl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
  color: var(--accent-gold);
  margin-bottom: var(--spacing-md);
  font-family: var(--font-heading);
  font-size: 1.1rem;
}

.footer-section ul {
  list-style: none;
  margin: 0;
}

.footer-section a {
  color: rgba(255,255,255,0.85);
}

.footer-section a:hover {
  color: var(--accent-gold);
}

.footer-divider {
  border-top: 1px solid rgba(255,255,255,0.2);
  padding-top: var(--spacing-lg);
  text-align: center;
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
}

/* ========================================
   FORMS
   ======================================== */

.form-group {
  margin-bottom: var(--spacing-md);
}

label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--primary);
}

input[type="text"],
input[type="email"],
input[type="phone"],
textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 1rem;
  transition: border-color 0.3s ease;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="phone"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(44, 95, 114, 0.1);
}

textarea {
  min-height: 120px;
  resize: vertical;
}

/* ========================================
   UTILITY CLASSES
   ======================================== */

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }

.highlight {
  color: var(--accent-gold);
  font-weight: 600;
}

.quote {
  border-left: 4px solid var(--accent-gold);
  padding-left: var(--spacing-md);
  font-style: italic;
  color: #666;
  margin: var(--spacing-lg) 0;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 1024px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  h1 { font-size: 2.5rem; }
  h2 { font-size: 2rem; }
  h3 { font-size: 1.5rem; }

  .hero-content {
    grid-template-columns: 1fr;
  }

  .hero-image {
    height: 350px;
  }

  .grid-2 {
    grid-template-columns: 1fr;
  }

  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-content {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.2rem; }

  nav ul {
    gap: var(--spacing-md);
    font-size: 0.9rem;
  }

  .menu-toggle {
    display: block;
  }

  nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background-color: var(--primary-dark);
    padding: var(--spacing-lg);
  }

  nav.active {
    display: block;
  }

  nav ul {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  .hero-text h1 {
    font-size: 1.8rem;
  }

  .section {
    padding: var(--spacing-xl) 0;
  }

  .grid-3 {
    grid-template-columns: 1fr;
  }

  .footer-content {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  :root {
    --spacing-lg: 24px;
    --spacing-xl: 32px;
  }

  body {
    font-size: 15px;
  }

  h1 { font-size: 1.5rem; }
  h2 { font-size: 1.25rem; }
  h3 { font-size: 1.1rem; }

  .container {
    padding: 0 var(--spacing-sm);
  }

  section {
    padding: var(--spacing-lg) 0;
  }

  .hero {
    margin-top: 70px;
    padding: var(--spacing-lg) 0;
  }
}